66311721024 has 112 divisors (see below), whose sum is σ = 186045506496. Its totient is φ = 20772864000.

The previous prime is 66311721019. The next prime is 66311721079. The reversal of 66311721024 is 42012711366.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2240724 + ... + 2270124.

Almost surely, 2^66311721024 is an apocalyptic number.

66311721024 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66311721024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93022753248).

66311721024 is an abundant number, since it is smaller than the sum of its proper divisors (119733785472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66311721024 is a wasteful number, since it uses less digits than its factorization.

66311721024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30124 (or 30114 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The spelling of 66311721024 in words is "sixty-six billion, three hundred eleven million, seven hundred twenty-one thousand, twenty-four".